The Seattle-Tacoma Metro Area is served by two separate transportation authorities, King County Metro and Sound Transit. These two independent and underdeveloped agencies operate local bus services and light rail services, respectively. In recent years, the Seattle-Tacoma metro area population and employment have soared, there has been an increased demand for a more developed and broader reaching rapid transit system. In 2021, both King County Metro and Sound Transit will integrate to form the

Seattle Area Metro (SAM). With the introduction of new rapid transit Metro lines and the integration of previously established Bus and Tramlines, the new Seattle Area Metro (SAM) will provide an all-encompassing service to the Seattle-Tacoma metro area.